#include"Date.h"

int Date::GetDay(int year, int month) {
	int Day[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };
	int day = Day[month];
	if (month == 2 && ((year % 4 == 0 && year % 100 != 0) ||( year % 400 == 0))) {
		day++;
	}
	return day;
}

Date::Date(int year,int month,int day)
{
	_year = year;
	_month = month;
	_day = day;
}


void Date::Print() 
{
	cout << _year << "-" << _month << "-" << _day << endl;
}

Date::Date(const Date& d) 
{
	_year = d._year;
	_month = d._month;
	_day = d._day;
}

Date& Date::operator+= (int day) {
	_day += day;
	while (_day > GetDay(_year, _month)) {
		_day -= GetDay(_year, _month);
		_month++;
		if (_month == 13) {
			_year++;
			_month = 1;
		}
	}
	return *this;
}

Date Date::operator+(int day) {
	Date tmp(*this);
	tmp._day += day;
	while (tmp._day > GetDay(tmp._year, tmp._month)) {
		tmp._day -= GetDay(tmp._year, tmp._month);
		tmp._month++;
		if (tmp._month == 13) {
			tmp._year++;
			tmp._month = 1;
		}
	}
	return tmp;
}

Date& Date::operator-=(int day) {
	_day -= day;
	while ( _day < 0) {
		_month--;
		if (_month == 0) {
			_year--;
			_month = 12;
		}
		_day += GetDay(_year, _month);
	}
	return *this;
}

Date Date::operator-(int day) {
	Date tmp(*this);
	tmp._day -= day;
	while (tmp._day < 0) {
		tmp._month--;
		if (tmp._month == 0) {
			tmp._year--;
			tmp._month = 12;
		}
		tmp._day += GetDay(tmp._year, tmp._month);
	}
	return tmp;
}

Date& Date::operator++() {
	if (_month == 12 && _day == GetDay(_year, _month)) {
		_year++;
		_month = 1;
		_day = 1;
	}
	else if (_day == GetDay(_year, _month)) {
		_month++;
		_day = 1;
	}
	else {
		_day++;
	}
	return *this;
}

Date Date::operator++(int) {
	Date tmp(*this);
	if (_month == 12 && _day == GetDay(_year, _month)) {
		_year++;
		_month = 1;
		_day = 1;
	}
	else if (_day == GetDay(_year, _month)) {
		_month++;
		_day = 1;
	}
	else {
		_day++;
	}
	return tmp;
}

Date& Date::operator--() {
	if (_month == 1 && _day ==1) {
		_year--;
		_month = 12;
		_day = GetDay(_year,_month);
	}
	else if (_day == 1) {
		_month--;
		_day = GetDay(_year, _month);
	}
	else {
		_day--;
	}
	return *this;
}

Date Date::operator--(int) {
	Date tmp(*this);
	if (_month == 1 && _day == 1) {
		_year--;
		_month = 12;
		_day = GetDay(_year, _month);
	}
	else if (_day == 1) {
		_month--;
		_day = GetDay(_year, _month);
	}
	else {
		_day--;
	}
	return tmp;
}

Date& Date::operator=(const Date& d) {
	_year = d._year;
	_month = d._month;
	_day = d._day;
	return *this;
}

bool Date::operator<(const Date& d) {
	if (_year <d._year) {
		return true;
	}
	if (_year == d._year && _month < d._month) {
		return true;
	}
	if (_year == d._year && _month == d._month && _day < d._day) {
		return true;
	}
	return false;
}

bool Date::operator==(const Date& d) {
	if (_year == d._year && _month == d._month && _day == d._day) {
		return true;
	}
	return false;
}

bool Date::operator>(const Date& d) {
	return !(*this < d) && !(*this == d);
}

bool Date::operator<=(const Date& d) {
	return (*this < d) || (*this == d);
}

bool Date::operator>=(const Date& d) {
	return (*this > d) || (*this == d);
}

bool Date::operator!=(const Date& d) {
	return !(*this == d);
}